#define _CRT_SECURE_NO_WARNINGS 1

#include <stdio.h>

int main() {
    int a, b, c;
    while (scanf("%d %d %d", &a, &b, &c) != EOF) {
        if (a == b && b == c)
            printf("Equilateral triangle!\n");
        else if ((a == b && b != c && (a + b) > c) || (a == c && b != c && (a + b) > c) || (b == c && a != c && (a + b) > c))
            printf("Isosceles triangle!\n");
        else if ((a + b) > c)
            printf("Ordinary triangle!\n");
        else
            printf("Not a triangle!\n");
    }
    return 0;
}